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LG 42PQ301R Service Manual
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LG 42PQ301R Service Manual

Chassis : pp91b
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PLASMA TV
SERVICE MANUAL
CHASSIS : PP91B
MODEL : 42PQ301R
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL60273009 (0906-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
42PQ301R-ZB
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea

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Summary of Contents for LG 42PQ301R

  • Page 1 Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com PLASMA TV SERVICE MANUAL CHASSIS : PP91B MODEL : 42PQ301R 42PQ301R-ZB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL60273009 (0906-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    CONTENTS ..........................2 SAFETY PRECAUTIONS ......................3 SPECIFICATION.........................4 ADJUSTMENT INSTRUCTION ....................8 BLOCK DIAGRAM ........................16 EXPLODED VIEW ........................17 SVC. SHEET ..........................Copyright ©2009 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...

  • Page 3: Safety Precautions

    An other abnormality exists that must be corrected before the receiver is returned to the customer. Copyright ©2009 LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...

  • Page 4: Specification

    Remark Appliance Safety: IEC/EN60065, EMI: EN55013, TEST EMS: EN55020 NON-EU Safety: IEC/EN60065, EMI: CISPR13 TEST Central and South America Copyright ©2009 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 Storage Environment 3) Temp. : -10 ~ 60deg 4) Humidity : 10 ~ 90% Input Voltage AC100-240V~, 50/60Hz Maker: LGIT Copyright ©2009 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...
  • Page 6 Model General Specification (1) EU Spec.(ZA) (2) NON-EU Spec.(TA) Copyright ©2009 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 (3) Central and South America(MA) Copyright ©2009 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...

  • Page 8: Adjustment Instruction

    (2) Use voltage : 3.3V (5 pin) (3) SCL : 15 pin (4) SDA : 12 pin (5) Tact time : about 2min and 30seconds Copyright ©2009 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 5) Click “Auto(2)” tab and set as below 6) Click “Run(3)”. 7) After downloading, check “OK(4)” message. ( Fig. 2) Copyright ©2009 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 After software D/L or PCBA manufacturing, you can download EDID Data. When you adjust Tool Option, H6 Model EDID download process is executed automatically Copyright ©2009 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11 <HDMI 3 : 256bytes> SIDE HDMI(HDMI 3) is adjusted above 60Tool model 5-4. EDID Data WXGA EDID DATA(50inch) <Analog(RGB) : 128bytes> XGA EDID DATA(42inch) <Analog(RGB) : 128bytes> Copyright ©2009 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 Contents Protection) Download HDCP download process is deleted in H6 models In H6 models, it is usimg the EEPROM masking HDCP Key Copyright ©2009 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 CA-100 more than CA-210. heat-run mode when pushing the power on by power only If CA-100 can not available, it is also good to use the CA-210. Copyright ©2009 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only...
  • Page 14 Target Value CA-210(LCD : CH 9, PDP : CH10), CA-100(PDP) 1) First decrease the B gain, 2) Decrease the one of the others. Copyright ©2009 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 Warm 0.313±0.002 0.329±0.002 6,500K +0.003 DDC Adjustment Command Set Adjustment Adjustment Adjustment [ R/G/B GAIN max value : C0 Copyright ©2009 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...

  • Page 16: Block Diagram

    BLOCK DIAGRAM Copyright ©2009 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...

  • Page 17: Exploded View

    EXPLODED VIEW IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and EXPLODED VIEW. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
  • Page 18 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 19 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 20 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 21 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 22 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 23 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 24 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 25 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 26 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 28 Remote control & Local switch checking First of all, Check whether there is SVC Bulletin in GCSC System for these model. Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 29 Power problem Section Section 2. Replace defective B/D ※Refer to the Module label for each voltage ☞A4 <SVC R/C & Pattern> Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 30 . HDMI Cable connection . Component Cable … Latest S/W update Replace from GCSC Main B/D (Firmware Management) Normal Close Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 31 Check Replace 1. Check Z-Sus Board Normal Normal Dark Picture Picture mode Module Picture? 2. Replace Board Picture? setting Close Close Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 32 ※ ’09 years new model apply chip tuner so, chip tuner is soldered on main PCB [ Chip Tuner: IC500(XC5000) ] Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 33 2. Replace Board Picture? 2.Replace Board Picture? Module on Y Drive B/D Close Close 1.Connector re-connection 2.Eliminate foreign material on FFC Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 34 Power B/D on Power B/D on Power B/D ☞A23 Close Check Power B/D Check Main B/D Replace Power B/D Replace Main B/D Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 35 Normal operation 2HOUR Off NO Signal Off “Off timer” Function off Move Don’t appear No Power problem Power Off History Section Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 36 Check Audio IC Explain customer that Replace Main B/D Cause is RF Signal’s problem (Case 1) Cause is Equipment’s problem (case 2) Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 37 Signal? Operation Output signal Connector solder (Key PCB + tool ) Close Close Repair/Replace Move Local switch B/D Power problem Section Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 38 PDP Module Rom Ver. Checking method Y Drive B/D Checking method Check Discharge resistor on Power B/D (Half picture) X- B/D Checking method(42/50G2) Next page Continued Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 39 Speaker cable checking method Check Remote control IR operation General Function Problem Check Local switch operating Check Local switch assembly status Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 40 5. In case of no picture, you can judge defect cause (Module or Main B/D) - If patterns appear, defect cause is Main B/D Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 41 2.Check whether speaker jack was inserted properly or not. GND ↔ R+ or R- or L+ or L- Audio output waveform Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 42 Va, Vs on Power B/D (Refer to the Module label for Vs specification) Check Va, Vs Va Adjustment (VR502) Vs Adjustment (VR901) Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 43 PDP Module Label Information. ⑨ ⑩ ① ⑧ ② ⑪ ③ ⑫ ④ ⑬ ⑤ ⑭ ⑦ ⑥ ⑮ -Vy Vsc Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 44 . Adjustment Point: VR502 2. Vsc (140V) on Y-Sus B/D Adjustment - Check Point: R520 –J263 - Adjustment Point: VR501 Adjustment Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 45 Voltage Check & Adjustment : 42G2 Z-Sus Board <Module Label> Adjustment Point 3. VZB (80V) on Z-Sus B/D . Check Point: R50↔J221 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 46 Adjustment 2. Vsc (135V) on Y-Sus B/D - Check Point: R202 - Adjustment Point: VR501 Vsc Adjustment ⓒ LG Electronics. Inc.2009 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 47 Z-Sus Board 3. VZB (80V) on Z-Sus B/D . Check Point: R271↔J125 . Adjustment Point: VR200 Adjustment Point ⓒ LG Electronics. Inc.2009 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 48 3) In case there are no voltage of 5V, Va, Vs, the board is failure, it need to replace the board. ⓒ LG Electronics. Inc.2009 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 49 Circuit No. Q11~Q14 D11,12 Forward 0.3~0.4V 0.3~0.4V 0.4~0.5V 0.3~0.4V Reverse OL(Overload) Q21~Q23 D21~D24 Forward 0.4~0.5V 0.3~0.4V Reverse OL(Overload) ⓒ LG Electronics. Inc.2009 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 50 Measuring Method Diode <Specification> Position Direction Classify Diode Forward 0.4~0.5V 0.3~0.4V Reverse OL(Overload) Forward 0.3~0.4V 0.3~0.4V Reverse OL(Overload) ⓒ LG Electronics. Inc.2009 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 51 Reverse OL (Overload) Q22,23 Forward 0.3~0.4V 0.3~0.4V Reverse OL(Overload) Q11~Q13 Q16~Q18 Forward 0.3~0.4V 0.3~0.4V 0.4~0.5V Reverse OL(Overload) ⓒ LG Electronics. Inc.2009 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 52 Diode Forward 0.4V~0.5V 0.3V~0.4V HS200 Reverse OL(Overload) Q311~312 Q313~Q318 D311,312 HS201 Forward 0.3V~0.4V 0.5V~0.6V 0.3V~0.4V Reverse OL(Overload) ⓒ LG Electronics. Inc.2009 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 53 Power Board Power B/D↔Main B/D (P813) (P1100) P813 P1100 P813 ▣ Measure 5V voltage ▣ Measure 12V voltage ⓒ LG Electronics. Inc.2009 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 54 MCM Check point (+)VS_DA / (-) GND (Normal: 3.3V ) ② Check LED On ① Check Input voltage ⓒ LG Electronics. Inc.2009 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 55 Symptom Mal discharge Symptom Revision ▣ Dot type Mal-discharge symptom ▣ Dark picture caused by Mal-discharge ▣ Scan type Mal-discharge symptom Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 56 ※Refer to the Module Rom upgrade manual Press “In-start” →Press” 0000” → Select Panel option → Pop up Module Rom ver. for Rom upgrade. USB Type Jig Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 57 If Y Drive have defect (short) , DMM display almost 0v. ※ DMM(Digital Multi Meter) (Red Probe”-”) (Black Probe”+”) Check all pin on output connector by using Black probe Output connecter Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 58 Check Discharge resistor (10Ω/22Ω 2~3ea) on Power B/D before replace Y Drive B/D 42” (Maker: LGIT,Sanken) 42” (Maker: Lite On) 50” HD(Maker: LGIT,Sanken) Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 59 Control B/D Y-Sus B/D Check Connector (TCP,FFC) connection on Board X B/D Va Input XL (Left X B/D) XR (Right X B/D) Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 60 Check Connector (TCP,FFC) connection on Board X B/D Connector XL↔XC Connector XC↔XR Va Input XL (Left X B/D) XC (Center X B/D) XR (Right X B/D) Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 61 3. Replace CTRL B/D 1. Check connection (Y-Sus B/D ↔Panel) Horizontal Line or Bar 2. Check Y-Sus B/D 3. Replace Y-Sus B/D Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 62 IC connect with Electrode pattern Electrode PAD Of PANEL and on Chip resistance (Direct Bonding) on X B/D Y Drive B/D,Z-Sus B/D ▣ Defect symptom Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 63 1. Check whether Signal Strength, Signal Quality is over 50% or not. 2. If Signal Strength, Signal Quality is under 50%,install the Booster to increase signal level. Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 64 Mechanical switch on (GND Value) STBY 5V AC DET High(3.3V~5V) RL_ON High(3.3V~5V) M5V_ON High(3.3V~5V) Vs-ON High(3.3V~5V) Check the other pin’s output Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 65 Adjust way ※ If happen Power board Protection, check whether there is Short or Open on Y-SUS, Z-SUS B/D or not. Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 66 After turn on by OnTimer, There is no operation for 2hours NO SIGNAL OFF In case that there is no signal for 15minutes Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 67 1.Check whether speaker jack was inserted properly on Mian B/D side & speaker side or not. 2. Check whether speaker cable have problem (disconnection wire) or not. Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 68 → Check Point: Pin 1( IR) IR Board for XXPQ20/30xx IR Board for XXPQ60xx → TV: power on status → Multi meter: Select DC 10V Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 69 → Multi meter: Select DC 10V 4. Check bad solder & assembly status on Tactical power switch Local switch Board for XXPQ60xx Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 70 Making 2009. 2 . 1 PDP TV Symptom Check Local switch assembly status Revision Check Local KEY assembly status XXPQ20/30xx XXPQ60xx Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

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